RE: SQL to find duplicate rows...

From: Jack C. Applewhite <japplewhite_at_inetprofit.com>
Date: Thu, 06 Dec 2001 14:09:04 -0800
Message-ID: <F001.003D6D55.20011206133522@fatcity.com>

Jim,

Oops! Right after I sent this, I saw that you asked to find, not delete, duplicates.

Sorry, I've spent the last two days de-duping a bunch of tables, so I've got deletion on the brain.

How about:

Select SomeColumn
>From MyTable

Where MyColumn In
(
Select MyColumn
From My Table
Group By MyColumn
Having Count(*) > 1
)
;

Jack

Jack C. Applewhite
Database Administrator/Developer
OCP Oracle8 DBA
iNetProfit, Inc.
Austin, Texas
www.iNetProfit.com
japplewhite_at_inetprofit.com
(512)327-9068

-----Original Message-----
Sent: Thursday, December 06, 2001 3:34 PM To: ORACLE-L_at_fatcity.com

Jim,

An option that handles multiple duplicates is:

Delete
>From MyTable

Where (MyColumn,RowID) In
(
Select MyColumn,RowID
From MyTable
Minus
Select MyColumn,Min(RowID)
From MyTable
Group By MyColumn
);

You could use Max(RowID) as well, depending on your needs.

Jack

Jack C. Applewhite
Database Administrator/Developer
OCP Oracle8 DBA
iNetProfit, Inc.
Austin, Texas
www.iNetProfit.com
japplewhite_at_inetprofit.com
(512)327-9068

-----Original Message-----
JAMES W [IT/1000]
Sent: Thursday, December 06, 2001 2:26 PM To: Multiple recipients of list ORACLE-L

Hello all,

I know this has come across many times now, and I thought I had it saved somewhere - you know how that goes...

I need to query a table to find all duplicate rows based on a given column. Don't feel like re-inventing the wheel...

Thanks in advance,
Jim

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Author: Jack C. Applewhite
  INET: japplewhite_at_inetprofit.com

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Received on Thu Dec 06 2001 - 16:09:04 CST